GM Automotive Technicians Technical Discussion and Fixes for Feb 4, 2004

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	Help Request	Answers
	1989 Buick Riviera T-Type 3.8L tcc lockup+1-2 shift VIN: 1G4EZ11C8J The car starts right up idles fast till warm up all is well until you attempt over 25-30 mph (regardless of gear selection, 1st, 3rd, 2nd, drive, etc.) Then right when the upshift to 2nd gear should occur, the engine cuts-out-as if on a sort of "rev-limiter" t...	View
	2000 Buick Park Avenue 3.8L Tire pressure monitor VIN: 1G4ACW52K4 The "tire pressure low" message is displayed in the drivers info readout. I have checked the tire pressure and they are all the same, about 35 psi. After clearing the message several times it still sets "tire pressure low".It takes about 1 week to set.	View
	1993 Cadillac DeVille 4.9L horn & warning lights VIN: 1G6CD53B3P This car came in with an ABS & service engine lights on and no horn opperation. We checked for codes and found none, used the scanner to try and clear lights. They came back on immediately. We disconnected the battery and they stayed off until we drove it. No ...	View
	1978 Chevrolet Malibu 5.0L No Start VIN: XXXXXXXXXX Burns dist. rotor or module every 1 or 2 months	View
	1988 Chevrolet Camaro 2.8L fuel gauge VIN: 2G1FPYYY69 Fuel gauge decided it wanted to read full all of the time. I unplugged the sender from the harness at the rear floor area, still read full. I figures it was a wire shorted under the carpet, removed the rear seat to trace from there to the kick panel. Unable to...	View
	1991 Chevrolet R1500 Suburban Silverado 5.7L Rear Brakes VIN: 1GNER16KXM Customer complaint of no rear brakes. Brake pedal height good. Tried on rack and brakes will barely stop with no load. On snow and ice absolutly no lock up. Ck'd rear shoes for fit, tried different ones anyway no change. Tried different preportion valve and by...	View
	1991 Chevrolet Lumina Z34 3.4L Surge, Stall In this car I have replaced EGR and IAC. Still surging. Thanks	View
	1993 Chevrolet Lumina Euro 3.1L cooling system VIN: 2G1WN54T1P This is a new one on me. Seems i've heard of it , but never heard what caused it. Engine oil is in the cooling system. Doesn't appear to be any coolant in the oil.Has anyone had this kind qf problem with a 3.1. I am leaning toward a head gasket problem. Any he...	View
	1994 Chevrolet C1500 5.7L 2-3 3-4 shift VIN: 1GTDC14KXR Truck in for no shift fluid burned. Overhauled trans all clearances correct --no shift pulled valve body corrected slipped checkball replaced torque converter replaced shift solenoids have good 1-2 shift slow 2-3 shift and slipping 3-4 shift Pressure is 80-100...	View
	1994 Chevrolet Cavalier RS 2.2L Cuts out, Stall VIN: 3GIJC1147R This vehicle has a strange problem first start in the morning the car runs perfect,but if you shut the car off after 20 or 30 secs and try to restart the car will constantly stall. If you hold your foot on the accelerator the car will continue to run,but if y...	View
	1996 Chevrolet C1500 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2GCE19R4T1 i need some extreme help, i have been struggling with the timing of this veh for about two days, when i took off the intake plenum i marked the distributor so it will be same as it came off, but this time this veh. is missing in all different cylinders, i have... Trouble codes: P0300	View
	1998 Chevrolet Cavalier Z24 2.4L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1G1JF12TXW OK GUYS HERE WE GO AGAIN, THIS CAR CAME IN ON THE HOOK, IT WILL START AND RUN ,BUT ACTS LIKE IT IS FLOODED. IT SEEMS TO BE RUNNING ON 2 CYL. AND MY OTC GENISYS CONFIRMS #2&4 CYLINDERS MISFIREING ALWAYS, WE HAVE SWITCHED COILS,INJECTORS,PLUGS,HAVE NOID AT ALL C... Trouble codes: P0300	View
	1999 Chevrolet Tracker 1.6L 4x4 air actuator pump VIN: 2CNBJ13C7X this 4x4 system uses air compressor to engage the front differential for 4 wheel drive my 4x4 light in the dash works after i removed switch and held plunger in by hand there was no check ball under plunger as is required any way when manually holding switch i...	View
	1999 Chevrolet K1500 Suburban 5.7L fuel gauge fuel gauge needle vibrated	View
	2000 Chevrolet Cavalier 2.2L steering column VIN: 1G1JC5243Y this car came in with a dry squeak noise coming from the steering column and we removed the intermedit shaft and put lube per tsb and that did not help then we removed the hole steering column from the car and completly took it apart and lubed everthing and re...	View
	2000 Chevrolet W4500 5.7L Blower motor VIN: 4KDC4B1R5Y This W4500 came in with no blower operation. Blower works with direct power. My Mitchell does not have a wiring diagram for this vehicle. I tried a full size truck but it is different. I have power on both wires so I believe that the ground is controled by a r...	View
	2001 Chevrolet Astro 4.3L Surge, Low power VIN: 1GCDM19W11 This van will intermittantly lose power, surge and detonate as if the fuel pump was going bad. Fuel pressure stays steady at approximately 64 psi when the condition occurs. A few weeks ago, the van got new plugs (AC), wires, cap, rotor, PCV valve, fuel filter,...	View
	2001 Chevrolet Astro 4.3L Hesitation, Surge VIN: 1GCDM19W01 This van exhibits a severe loss of power at 3/4 throttle going up a hill only under a load. Vehicle runs great around town. If you back off the throttle while this occuring and hit it again the problem typically goes away. No problems are noted upon start up. ... Trouble codes: 300 (random misfire)	View
	1992 GMC Jimmy SLE 4.3L Hesitation, Misfire VIN: 1GKDT13WXN now i am reading code 42 and it has i miss at a idle and when you are acculerating. it gets worst when it worms up. it says that it could possible be a malfunctioning hei module if that is it do i have to replace the hole distributor Trouble codes: 42 (electronic sperk timing EST)	View
	1995 GMC Sonoma SLE 2.2L engine VIN: 1GTCS1940S hello.we got this truck in a week ago.the customer had just replaced the head gasket and it was still leaking.we took it off and checked it .it was warped bad.about .030.we had it resurface and ground the valves.the problem is the truck will not rev up past 25...	View
	1986 Oldsmobile Toronado Brougham 3.8L blinker switch VIN: 1G3EZ57B8G HELLO ALL, i have a 86 tornado brougham in the shop that has a bad blinker/high beam switch. we cannot find a new switch antwhere!!! any ideas would be appreciated. this car is in showroom condition and the customer will be heartbroken if we cannot source a s...	View
	1988 Oldsmobile 98 Regency Brougham 3.8L No Start, Misfire VIN: 1G3CW51C8J car came to me with no spark, no paulse. found broken crank sensor/bent vane on damperner, new crank sensor used damperner. it started and had many other problems!! custermer had no money to fix any thing else. got five miles away and began to miss bad! he com... Trouble codes: 43 (Knock sensor threr isnt one on this used engine), 42 (EST sets during cranking and it back fire in the air box)	View
	2001 Oldsmobile Alero GL 3.4L No Start, Cuts out VIN: 1G3NL52E81 I have this 01 Alero that is kicking my tail! It came in on the hook as a no start. Car cranks, starts and dies. So I grabbed my trusty Mastertech and got "No class 2 I/O found" So I got the shop's Modis, just plain "no communication" Checked the Class 2 line ...	View
	1989 Pontiac Sunbird LE 2.0L cooant reservoir VIN: 1XM35RCK1J This vehicle has the large coolant cap with drop-in thermostat type system on top of the engine. The problem is that with the engine at normal operating temp., but at idle for more than a minute, the cooling system bubbles or gurgles into the coolant reservoir...	View
	1999 Pontiac Bonneville SE 3.8L Poor Idle Quality, Misfire VIN: 1G2HX52K8X Intermintant rough idle no codes miss fire data (History)showing number 6 cylinder missing number is in the 8-900 range. Any hints on what I should be checking next would be great Thanks Guys	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1987 Buick LeSabre 3.8L Unknown VIN: 1G3HN5433H Got 16 fixes for this car. Most people nailed the problem. Someone had used the wrong crankshaft sensor and thrown the shield away. Thanks for all the replies.	18
	1991 Buick Park Avenue 3.8L No Start VIN: 1G4CW53L5M Special thanks to Tim from Florida. As per Tim [...] rapidly grounded the blue wire to pin A2 at the Passkey Module. This set a code 58(for Passkey System) and enabled the computer to control the fuel injectors. The PCM was not enabling fuel injection. My customer...	7
	1997 Buick LeSabre Custom 3.8L fuel gauge VIN: 1G4HP52K2V well costumer needed vehicle so I did not get a chance to continue testing. 3 replies that stated to check wiring , another said that the cluster was a common problem .the only thing I was going to do was to install a inline resister to make sure we didn't had...	3
	1990 Cadillac Brougham 5.7L MIL Lamp on VIN: 1G6DW5475L thank you iatn and all members, we have another happy customer. the nine replies we received were all definite possibilities, (from checking fuel pressure & volume, checking t/stat housing ground connection to ecm, exhaust back pressure, cam gear wear, and ign... Trouble codes: 43 (knock sensor circuit).	10
	1993 Cadillac DeVille 4.9L remote keyless entry VIN: 1G6CD53B9P This will be easier next time. Remote Keyless Entry module(receiver) was the culprit. Since you can't test it directly(solid state circuitry),you test the same way you would a PCM. Verify power and grounds, eliminate possibility of interference with other comp...	3
	1984 Chevrolet C30 Custom 6.2L Glow Plugs VIN: 1GCGD34J0E We found the correct part number for this sensor is #[...]. This is not the correct part for this application. The glow...	7
	1984 Chevrolet K30 Custom 5.7L Steering VIN: 1GBHV34KXH Hi, i have not yet had the customer bring the truck back in for a recheck but several people gave me good ideas. First I am going to check the frame at the steering box to make sure it is not cracked. Second i am going to check the level on the pitman idler ar...	27
	1986 Chevrolet K20 Scottsdale 5.7L Hesitation VIN: 1GCEK24MXG Ahh..the smell of burning rubber ! Had some good info come in from you Guys--lots of thoery from Carl but Jerry gets to ride off a tank of Premium fuel in the rig ! Here is what I done: Pulled the distributor and put on dist machine(bear in mind this is a new ...	14
	1997 Chevrolet K1500 4.3L Stall VIN: IGCEK14W5V Hi guys and girls-A new fuel tank unit(and pump) fixed this one.Customer is happy and so are we.Big thanks to everyone who replied.With IATN we can fix ANYTHING.By for now.K.W.	13
	1999 Chevrolet K2500 Suburban 7.4L ride control VIN: 3GNGK26J4X There were some very knowledgable responses to this problem which seemed to boil down to anamolies in power steering boost caused by the steering wheel speed sensor and springs that began to collapse. I could not confirm either on this truck but one clue did s...	12
	2001 Chevrolet Astro 4.3L transfer case VIN: 1GCDL19W51 thanks to all that responded. the encoder motor on this vehicle was intermittently sticking. as i learned, you can not bench test this unit to diagnose or damage will occur. the way to diag. is by checking all wiring (ohms) then pretty much replacing motor. a ...	5
	2001 Chevrolet Silverado 2500 HD 6.0L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1GCHC24601 turns out to be partially clogged cat on left bank. replaced & runs great. thanks for all the replies. Trouble codes: 303 (misfire 3), 300 (random misfire).	7
	2001 Chevrolet Corvette Z06 5.7L ebcm VIN: 1G1YY12S21 I have not had the opportunity to work on this car in a few weeks. Only 3 people have replied and they seem to think the same thing I do; stray RF interference or a magnetic field that is produced by the 14' rotors. I am going to try to find a twisted pair of ...	3
	1990 Geo Prizm GSi 1.6L Poor Idle Quality, Stall VIN: 1Y1SL5457L replies for this problem have not been helpful in finding a problem . the vehicle was sent to dealer who would not work could not determine problem but said vehicle was burning oil. still have vehicle and will update any information found in the future.	8
	1992 GMC Jimmy SLE 4.3L No Start, Hesitation, Stall, Misfire VIN: 1GKDT13WXN thanks it was the check valve in the fuel pump. i replaced the cpi unit and the two lines going to it and the fuel pump took care of my not wanting to start problem.	9
	1996 Oldsmobile 88 Royale 3.8L Poor Idle Quality, Misfire VIN: 1G3HN52K7T I recieved two emails on this posting that agreed with my final diagnosis.Phil [...] both sugested a worn valve guide, something I have gone around in circles chasing before.After removing the valve springs I confirmed the valve guide wear a... Trouble codes: P0300, P0301.	17
	1997 Oldsmobile Cutlass Supreme SL 3.1L Surge, Cuts out VIN: 1G3WH12MXV Nothing concrete to report. One reply was the use of dielectric grease under the coil. I had already used it on other connections, but not under the coils. Now I have. Another was a TSB about some foreign material in the fuel tank. If this is the case, it must...	6
	1997 Pontiac Grand Prix SE 3.8L No Start, extended cranking VIN: 1G3CW69B2G Hi group, once again I'm closing this request without a fix. The customer has admitted that it has improved, which is a start. Once again I thank those that responded will send out personal thanks. The general feelings of the reponses was either an internal co...	11
	1998 Pontiac Sunfire SE 2.4L abs system VIN: 1G2JB1241W I got the car back in yesterday and went through resistance testing for all 4 wheels-NO PROBLEMS. I also put a used ABS-ECM and rear harness in and it made no difference.	8
	1999 Pontiac Montana 3.4L MIL Lamp on VIN: 1GMDU03E1X Thanks for all the replies. Turns out the problem was the gas cap. The vehicle was setting a code every day for the evap system. We put a gas cap on and called the customer after 5 days and light was. We started to pull are hair out and it was so simple. Excel... Trouble codes: P0440, P0453, P0463.	4
	1992 Saturn SL2 1.9L Surge, Cuts out VIN: 1G8ZK5475N i wont to thank STEVE [...] for your help they had a after market P.C.M I GOT ONE FROM SATURN CAR RUNS NOW SHE HAS TO GET A REFOUND FROM THE OTHERE SHOP GOD BLESS Trouble codes: 82 (s.p.i interferance).	3

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